I recieved Halo for Christmas from a friend who knew I was in the market for a new Mac laptop. Right now the choices are 12"iBook G4 640MB or 12"Powerbook (rev b) 768MB, does Halo play any better on one system then the other, seeing how the IB has a better card then the pb's, but then again the pb's processor is faster. I'd appreciate it if anyone could help seeing how this just might make my decision between the two a bit easier.